Electric lamp



epfc- 29, 1931. H. A, DQUGLAS 1,824,804

ELECTRIC LAMP Filed 001;. 23, 1929 2 Sheets-Sheet l 2 Sheets-Sheet 2 Sep&. 2Q, 1931. H. A. DOUGLAS ELECTRIC LAMP Filed 001;. 23. 1929 Patented Sept. 29, i 1931 m ALD UGLAS, or BRONSON, ru'cnronn ntnc'rmc LAMP Application filed October 23, 1929.- Serial No. 401,724.

' My invention relates to lamps which eniploy lamp receiving sockets andholdersfor the sockets. The invention is of particular importance where such a lamp is equipped with a concave reflector which carries the holder whose bore is in register with anopening provided through the reflector. I The invention has for its general object the provision of means whereby the lamp may be fixed with respect to vsaid holder and, wherethe lamp is equipped with a reflector, may be fixed with respect to the latter element, also. The invention finds particular use in connection with lamps having parabolic reflectors 1 and enables the fixed relationshipof the lamp filament with respect to the parabolic axis on which the filament is preferably located. A

lamp thus constructed will direct light in a fixed path withrespect to the axis of the re- 2 flector, thereby avoiding difiiculty now frequently encounteredinthe adaptation. of re fleeting lampsto automotive vehicles, bodily or other adjustment of the lamps having frequently been required when the users happen to find that the light is improperlydirected.

- In my copending application Serial .No. 403,613 filed October 30, 1929, I have broadly claimed a lampreceiving socket within'a holder andsmallerin cross section than the holder, and means pressing the socket laterally against one side of the holder. The structure disclosed in the aforesaid copendwith respect to whichthe socket holder is g fixed, the bore of the socket holder being in with an opening that is formed the reflector to permit of theinserofan incandescent, lamp.

register through tion of the base The structure of the aforesaid application is 40 also inclusive ofspaced apart spacing means intervening between the holder'and socket in the place at which the socket is pressed I tatively, The lamp socket,-in the structure against the holder. j The structure of my aforesaid copending application is inclusive of a spring, integrally formed with a holder, whichpresses laterally upon the lamp base and, through theinterr,

mediation of the lamp base, laterally upon the socket. In the structure of my present invention I employ a; spring-which is sepathe lamp base through which base the lateral or application employs a concave reflector rately formed from the holder. This spring is preferably a coiledv s ring and passes through a lateral slot to e ect pressure upon the lamp socket and, preferably also, upon pressure is exerted upon the socket, whereby all of these elements aremaintained infixed relation. 7

In. my. copending application Serial No. 401,721 filed October =23, 1929, I have dis-- 6O closed a socket holder having a cam form'ation positioned to be engaged bya pin or projection that is provided upon the socket, when the assemblyof the holder and socketis being effected, to increase the spacing between.

i the socket and holder in the region of the pro jection, so that the projection may be brought intorregister withv a lateral opening, inthe socket, that is to receive the projection. In

' the device of the latter copending applica- To tlon the widening of the spacing between the holder and socket is effected by shifting the 'socket laterally of the holder. In the device of my present application the portion of the holder having the opening is also a spring .75

and is also provided with a camming formation ,engageable by the projection uponthe socket, the spring being laterally flexed by the projection when being directed to the opening in the spring. 7 v

I If the holder be associated with a reflector, the position of the lamp filament with respect to the reflector is assured, it being understood that the lamp filaments of the incandescent lamps which are to be used in the structure.

of my invention preferably occupy predeter mined uniform positions with respect to the lamp bases. To further assure the precise positions of the lamps, I desirably provide V- shaped seats in the bayonet slots that receive the bayonet pins upon the lamps, so that the lampsare brought to auniform position roof my invention, is preferably prevented from having any longitudinal .adjustment,,so

the bulb being broken away; Fig. 3 is a side W view; Fig. 4 is a sectional view online 4 4:

of Fig. 1; Fig. 5 is a sectional viewioniline.

55 of Fig. 4; Fig. 6 is a sectional View on line 66 of Fig. 4; Fig.7 is aperspective view illustrating component parts of the structure in separated relation; .and Fig. 8 is a sectional elevation taken through the axis of the parabolic reflector.

The lamp illustrated includes a housing or back element 1 having a bracket 2 on its bot tom side by which it may be assembled with the .automotive vehicle or other support, as

indicated. The housing or back 1 encloses a parabolic reflector 3 which is formedwith a grooved flange 4 at its forward end. This 'flange is pressed against a rim 5, provided upon the housing, by an assembling ring 6. This assembling ring also presses the light transmitting. closure 7 ,"usually of glass, 30

against a gasket 8 which is seated in the flange 4'. V i i The generally cylindrical socket holder 9 has its forward end passed through a circular opening formed through the crown of the reflector, in the embodiment of the invention shown. The forward end of the holder which the surrounding edge portion of the reflector is clamped, whereby the holder and reflector are maintained coaxial, in the structure illustrated.

The generally cylindrical lamp socket 12 is V held .in'assembly with and within the holder 9 of the bayonet slot by any suitable means,,

the V-shaped seat holding the lamp from rotative movement. The; means illustrated is inclusive ofa coiled spring .16 which sur- 'rounds a plunger 17 constituting a circuit terminal and presses forwardly upon the plunger head'18 and rearwardly upon the, flange 19 of a metallic guiding sleeve 20..

v This guiding sleeve is mounted upon an insu- 'The plunger head 18 presses against a contact lating disc 21 which is fixedlyassembled with holder, ,whereby th'e spring tongue is deflected and within the rearend of. the socket 12.

22 which is carried by the generally cylindrical lamp'base 15 which is made of insulating material.

filament 25. Another stiff leading in wire 26 tegra-lly formedwith the holder. The ribs The lamp structure illustrated is a'so-calle'd single pole structure, though the invention is not to be thus limited. Where a single pole structure is employed, the contact 22 is upon the axis of the lamp base. A stiff leading in wire 24 establishes connection between the contact 22 and one terminal of the establishesia connection betweenjthe other terminal of the filament and the metallic sheath '27 which surrounds the insulating portion of the sheath 27 is also grounded as it has connection with the holder, as will more fully appear. 7 V In carrying out my invention the cross section of the socket 12is smaller than the bore of the holder 9 and the baseof the lamp, iiielusive ofits sheath27,is smaller, in cross section, than the bore of thesocket. 1 Spaced apart spacing means intervene between the'holder 9 and the socket 12. These spacing means arepreferably in the form of bo ribs 28 which extend longitudinally of the holder and socket. Each rib is desirably integrally formed with one of the elements 9 or 12, both ribs being shown as: being in are spaced less than 180 degrees apart, preferably 120 degrees apart. The means for pressing the socket 12 against the holder 9 is desira bly'inclusive of a coiled spring 29 which surrounds-the lamp base and passes through I fregistering slots 30 and 31, respectively "9 is formed with flanges 10 and 11 between lamp base laterally against the socket and to press the socket laterally against the holder.- 1 The spacing ribs 28 s'erve to maintain the socket parallel with the holder and in fixed relation to the axis of the reflector. Spacing ribs 32,,whichmay for example,-be-provided upon the sheath 27 longitudinally of the lamp base, intervene between such base and the socket, whereby the lamp base is maintained parallel with the socket} These ribs 32 are desirably also. spaced 120 degrees apart.

The' holder is" formed withj'a lateral cir-' cular opening 33lina spring tongue 34 which is integrally formed with'the holder; This opening receives the pin or projection-35' that is provided upon the socket. The rear end of the spring tongue 3 1 is provided with a cam or wedging formation 36. This wedging formation is engaged by the projection 35- in the processofassembling the socket with the laterally to fpermit the projection to be '125 brought into register with-the opening 33,

wherupon the spring tongue returns toen-ter lamp is accurately positioned with respect to the reflector, this position being predetermined it the filaments of all lamps to be used in my device are accurately positioned with respect to the lamp bases.

Changes may be made without departing from the invention.

Having thus described my invention, I claim: I

1. The combination with a transversely slotted socket holder; of a transversely slotted lamp receiving socket within said holder and smaller in cross section than the bore ofthe holder; a lamp having a base received in said socket, this base being smaller in cross section than the bore of the socket, the slots in said holder and socket being in register with each other and with a portion of the lamp base; and spring means, separately formed from the holder, passing through said slots into engagement with the lamp base and pressing the lamp base against the socket and pressing the socket, through the intermediation of the lamp base, against the holder.

2. The combination with a socket holder; of a lamp receiving socket within said holder and smaller in cross section than the bore of the holder; and a coiled spring, separately formed from the holder, pressing the socket laterally against one side of said holder to position the socket with respect to the holder, said spring encircling the said holder and socket and being retained by having its free ends hooked together.

3. The structure of claim 2 wherein the holder is formed with a lateral slot through which the spring is passed to press upon the socket.

4. The combination with a socket holder; of a lamp receiving socket within said'holder and smaller in cross section than the bore of the holder; a lamp having a base received in said socket, this base being smaller in cross section than the bore of the socket, said holder and socket having registering lateral slots that are in register with a portion of the lamp base; and a coiled spring, separately formed from the holder, surrounding the lamp base and pressing the lamp against the socket and pressing the socket, through the intermediation of the lamp base against the holder.

5. The combination with a socket holder having a portion formed into a spring and having a lateral opening in this spring; of a socket within said holder and having a lateral projection, said spring having a cam formation positioned to be engaged by the projection when the assembly of the holder and socket is being efiected, the spring yielding to enable the projection to be passed into register with the opening whereupon the spring returns to enter the projection within the opening.

6. The structure of claim 5 wherein the socket is of smaller cross section than the bore of the holder and the spring presses the socket against the opposite side of the holder, and wherein spaced apart spacing means intervene between the socket and holder at the place where the socket is pressed against the holder.

7. The structure of claim 5 wherein the socket is of smaller cross section than the bore of the holder and the spring presses the socket against the opposite side of the holder, and wherein spaced apart spacing means in the form of ribs extending along the socket intervene between the socket and holder at the place where the socket'is pressed against my name.

HARRY A. DOUGLAS. 

